1/* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * dlmunlock.c 5 * 6 * underlying calls for unlocking locks 7 * 8 * Copyright (C) 2004 Oracle. All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public 12 * License as published by the Free Software Foundation; either 13 * version 2 of the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public 21 * License along with this program; if not, write to the 22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23 * Boston, MA 021110-1307, USA. 24 * 25 */ 26 27 28#include <linux/module.h> 29#include <linux/fs.h> 30#include <linux/types.h> 31#include <linux/slab.h> 32#include <linux/highmem.h> 33#include <linux/utsname.h> 34#include <linux/init.h> 35#include <linux/sysctl.h> 36#include <linux/random.h> 37#include <linux/blkdev.h> 38#include <linux/socket.h> 39#include <linux/inet.h> 40#include <linux/spinlock.h> 41#include <linux/delay.h> 42 43#include "cluster/heartbeat.h" 44#include "cluster/nodemanager.h" 45#include "cluster/tcp.h" 46 47#include "dlmapi.h" 48#include "dlmcommon.h" 49 50#define MLOG_MASK_PREFIX ML_DLM 51#include "cluster/masklog.h" 52 53#define DLM_UNLOCK_FREE_LOCK 0x00000001 54#define DLM_UNLOCK_CALL_AST 0x00000002 55#define DLM_UNLOCK_REMOVE_LOCK 0x00000004 56#define DLM_UNLOCK_REGRANT_LOCK 0x00000008 57#define DLM_UNLOCK_CLEAR_CONVERT_TYPE 0x00000010 58 59 60static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, 61 struct dlm_lock_resource *res, 62 struct dlm_lock *lock, 63 struct dlm_lockstatus *lksb, 64 int *actions); 65static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, 66 struct dlm_lock_resource *res, 67 struct dlm_lock *lock, 68 struct dlm_lockstatus *lksb, 69 int *actions); 70 71static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, 72 struct dlm_lock_resource *res, 73 struct dlm_lock *lock, 74 struct dlm_lockstatus *lksb, 75 int flags, 76 u8 owner); 77 78 79/* 80 * according to the spec: 81 * http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf 82 * 83 * flags & LKM_CANCEL != 0: must be converting or blocked 84 * flags & LKM_CANCEL == 0: must be granted 85 * 86 * So to unlock a converting lock, you must first cancel the 87 * convert (passing LKM_CANCEL in flags), then call the unlock 88 * again (with no LKM_CANCEL in flags). 89 */ 90 91 92/* 93 * locking: 94 * caller needs: none 95 * taken: res->spinlock and lock->spinlock taken and dropped 96 * held on exit: none 97 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network 98 * all callers should have taken an extra ref on lock coming in 99 */ 100static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm, 101 struct dlm_lock_resource *res, 102 struct dlm_lock *lock, 103 struct dlm_lockstatus *lksb, 104 int flags, int *call_ast, 105 int master_node) 106{ 107 enum dlm_status status; 108 int actions = 0; 109 int in_use; 110 u8 owner; 111 112 mlog(0, "master_node = %d, valblk = %d\n", master_node, 113 flags & LKM_VALBLK); 114 115 if (master_node) 116 BUG_ON(res->owner != dlm->node_num); 117 else 118 BUG_ON(res->owner == dlm->node_num); 119 120 spin_lock(&dlm->spinlock); 121 /* We want to be sure that we're not freeing a lock 122 * that still has AST's pending... */ 123 in_use = !list_empty(&lock->ast_list); 124 spin_unlock(&dlm->spinlock); 125 if (in_use) { 126 mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock " 127 "while waiting for an ast!", res->lockname.len, 128 res->lockname.name); 129 return DLM_BADPARAM; 130 } 131 132 spin_lock(&res->spinlock); 133 if (res->state & DLM_LOCK_RES_IN_PROGRESS) { 134 if (master_node) { 135 mlog(ML_ERROR, "lockres in progress!\n"); 136 spin_unlock(&res->spinlock); 137 return DLM_FORWARD; 138 } 139 /* ok for this to sleep if not in a network handler */ 140 __dlm_wait_on_lockres(res); 141 res->state |= DLM_LOCK_RES_IN_PROGRESS; 142 } 143 spin_lock(&lock->spinlock); 144 145 if (res->state & DLM_LOCK_RES_RECOVERING) { 146 status = DLM_RECOVERING; 147 goto leave; 148 } 149 150 if (res->state & DLM_LOCK_RES_MIGRATING) { 151 status = DLM_MIGRATING; 152 goto leave; 153 } 154 155 /* see above for what the spec says about 156 * LKM_CANCEL and the lock queue state */ 157 if (flags & LKM_CANCEL) 158 status = dlm_get_cancel_actions(dlm, res, lock, lksb, &actions); 159 else 160 status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions); 161 162 if (status != DLM_NORMAL && (status != DLM_CANCELGRANT || !master_node)) 163 goto leave; 164 165 /* By now this has been masked out of cancel requests. */ 166 if (flags & LKM_VALBLK) { 167 /* make the final update to the lvb */ 168 if (master_node) 169 memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN); 170 else 171 flags |= LKM_PUT_LVB; /* let the send function 172 * handle it. */ 173 } 174 175 if (!master_node) { 176 owner = res->owner; 177 /* drop locks and send message */ 178 if (flags & LKM_CANCEL) 179 lock->cancel_pending = 1; 180 else 181 lock->unlock_pending = 1; 182 spin_unlock(&lock->spinlock); 183 spin_unlock(&res->spinlock); 184 status = dlm_send_remote_unlock_request(dlm, res, lock, lksb, 185 flags, owner); 186 spin_lock(&res->spinlock); 187 spin_lock(&lock->spinlock); 188 /* if the master told us the lock was already granted, 189 * let the ast handle all of these actions */ 190 if (status == DLM_CANCELGRANT) { 191 actions &= ~(DLM_UNLOCK_REMOVE_LOCK| 192 DLM_UNLOCK_REGRANT_LOCK| 193 DLM_UNLOCK_CLEAR_CONVERT_TYPE); 194 } else if (status == DLM_RECOVERING || 195 status == DLM_MIGRATING || 196 status == DLM_FORWARD) { 197 /* must clear the actions because this unlock 198 * is about to be retried. cannot free or do 199 * any list manipulation. */ 200 mlog(0, "%s:%.*s: clearing actions, %s\n", 201 dlm->name, res->lockname.len, 202 res->lockname.name, 203 status==DLM_RECOVERING?"recovering": 204 (status==DLM_MIGRATING?"migrating": 205 "forward")); 206 actions = 0; 207 } 208 if (flags & LKM_CANCEL) 209 lock->cancel_pending = 0; 210 else 211 lock->unlock_pending = 0; 212 213 } 214 215 /* get an extra ref on lock. if we are just switching 216 * lists here, we dont want the lock to go away. */ 217 dlm_lock_get(lock); 218 219 if (actions & DLM_UNLOCK_REMOVE_LOCK) { 220 list_del_init(&lock->list); 221 dlm_lock_put(lock); 222 } 223 if (actions & DLM_UNLOCK_REGRANT_LOCK) { 224 dlm_lock_get(lock); 225 list_add_tail(&lock->list, &res->granted); 226 } 227 if (actions & DLM_UNLOCK_CLEAR_CONVERT_TYPE) { 228 mlog(0, "clearing convert_type at %smaster node\n", 229 master_node ? "" : "non-"); 230 lock->ml.convert_type = LKM_IVMODE; 231 } 232 233 /* remove the extra ref on lock */ 234 dlm_lock_put(lock); 235 236leave: 237 res->state &= ~DLM_LOCK_RES_IN_PROGRESS; 238 if (!dlm_lock_on_list(&res->converting, lock)) 239 BUG_ON(lock->ml.convert_type != LKM_IVMODE); 240 else 241 BUG_ON(lock->ml.convert_type == LKM_IVMODE); 242 spin_unlock(&lock->spinlock); 243 spin_unlock(&res->spinlock); 244 wake_up(&res->wq); 245 246 /* let the caller's final dlm_lock_put handle the actual kfree */ 247 if (actions & DLM_UNLOCK_FREE_LOCK) { 248 /* this should always be coupled with list removal */ 249 BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK)); 250 mlog(0, "lock %u:%llu should be gone now! refs=%d\n", 251 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)), 252 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)), 253 atomic_read(&lock->lock_refs.refcount)-1); 254 dlm_lock_put(lock); 255 } 256 if (actions & DLM_UNLOCK_CALL_AST) 257 *call_ast = 1; 258 259 /* if cancel or unlock succeeded, lvb work is done */ 260 if (status == DLM_NORMAL) 261 lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB); 262 263 return status; 264} 265 266void dlm_commit_pending_unlock(struct dlm_lock_resource *res, 267 struct dlm_lock *lock) 268{ 269 /* leave DLM_LKSB_PUT_LVB on the lksb so any final 270 * update of the lvb will be sent to the new master */ 271 list_del_init(&lock->list); 272} 273 274void dlm_commit_pending_cancel(struct dlm_lock_resource *res, 275 struct dlm_lock *lock) 276{ 277 list_move_tail(&lock->list, &res->granted); 278 lock->ml.convert_type = LKM_IVMODE; 279} 280 281 282static inline enum dlm_status dlmunlock_master(struct dlm_ctxt *dlm, 283 struct dlm_lock_resource *res, 284 struct dlm_lock *lock, 285 struct dlm_lockstatus *lksb, 286 int flags, 287 int *call_ast) 288{ 289 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 1); 290} 291 292static inline enum dlm_status dlmunlock_remote(struct dlm_ctxt *dlm, 293 struct dlm_lock_resource *res, 294 struct dlm_lock *lock, 295 struct dlm_lockstatus *lksb, 296 int flags, int *call_ast) 297{ 298 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 0); 299} 300 301/* 302 * locking: 303 * caller needs: none 304 * taken: none 305 * held on exit: none 306 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network 307 */ 308static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm, 309 struct dlm_lock_resource *res, 310 struct dlm_lock *lock, 311 struct dlm_lockstatus *lksb, 312 int flags, 313 u8 owner) 314{ 315 struct dlm_unlock_lock unlock; 316 int tmpret; 317 enum dlm_status ret; 318 int status = 0; 319 struct kvec vec[2]; 320 size_t veclen = 1; 321 322 mlog_entry("%.*s\n", res->lockname.len, res->lockname.name); 323 324 if (owner == dlm->node_num) { 325 /* ended up trying to contact ourself. this means 326 * that the lockres had been remote but became local 327 * via a migration. just retry it, now as local */ 328 mlog(0, "%s:%.*s: this node became the master due to a " 329 "migration, re-evaluate now\n", dlm->name, 330 res->lockname.len, res->lockname.name); 331 return DLM_FORWARD; 332 } 333 334 memset(&unlock, 0, sizeof(unlock)); 335 unlock.node_idx = dlm->node_num; 336 unlock.flags = cpu_to_be32(flags); 337 unlock.cookie = lock->ml.cookie; 338 unlock.namelen = res->lockname.len; 339 memcpy(unlock.name, res->lockname.name, unlock.namelen); 340 341 vec[0].iov_len = sizeof(struct dlm_unlock_lock); 342 vec[0].iov_base = &unlock; 343 344 if (flags & LKM_PUT_LVB) { 345 /* extra data to send if we are updating lvb */ 346 vec[1].iov_len = DLM_LVB_LEN; 347 vec[1].iov_base = lock->lksb->lvb; 348 veclen++; 349 } 350 351 tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key, 352 vec, veclen, owner, &status); 353 if (tmpret >= 0) { 354 // successfully sent and received 355 if (status == DLM_FORWARD) 356 mlog(0, "master was in-progress. retry\n"); 357 ret = status; 358 } else { 359 mlog_errno(tmpret); 360 if (dlm_is_host_down(tmpret)) { 361 /* NOTE: this seems strange, but it is what we want. 362 * when the master goes down during a cancel or 363 * unlock, the recovery code completes the operation 364 * as if the master had not died, then passes the 365 * updated state to the recovery master. this thread 366 * just needs to finish out the operation and call 367 * the unlockast. */ 368 ret = DLM_NORMAL; 369 } else { 370 /* something bad. this will BUG in ocfs2 */ 371 ret = dlm_err_to_dlm_status(tmpret); 372 } 373 } 374 375 return ret; 376} 377 378/* 379 * locking: 380 * caller needs: none 381 * taken: takes and drops res->spinlock 382 * held on exit: none 383 * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID, 384 * return value from dlmunlock_master 385 */ 386int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data, 387 void **ret_data) 388{ 389 struct dlm_ctxt *dlm = data; 390 struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf; 391 struct dlm_lock_resource *res = NULL; 392 struct list_head *iter; 393 struct dlm_lock *lock = NULL; 394 enum dlm_status status = DLM_NORMAL; 395 int found = 0, i; 396 struct dlm_lockstatus *lksb = NULL; 397 int ignore; 398 u32 flags; 399 struct list_head *queue; 400 401 flags = be32_to_cpu(unlock->flags); 402 403 if (flags & LKM_GET_LVB) { 404 mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n"); 405 return DLM_BADARGS; 406 } 407 408 if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) { 409 mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL " 410 "request!\n"); 411 return DLM_BADARGS; 412 } 413 414 if (unlock->namelen > DLM_LOCKID_NAME_MAX) { 415 mlog(ML_ERROR, "Invalid name length in unlock handler!\n"); 416 return DLM_IVBUFLEN; 417 } 418 419 if (!dlm_grab(dlm)) 420 return DLM_REJECTED; 421 422 mlog_bug_on_msg(!dlm_domain_fully_joined(dlm), 423 "Domain %s not fully joined!\n", dlm->name); 424 425 mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none"); 426 427 res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen); 428 if (!res) { 429 /* We assume here that a no lock resource simply means 430 * it was migrated away and destroyed before the other 431 * node could detect it. */ 432 mlog(0, "returning DLM_FORWARD -- res no longer exists\n"); 433 status = DLM_FORWARD; 434 goto not_found; 435 } 436 437 queue=&res->granted; 438 found = 0; 439 spin_lock(&res->spinlock); 440 if (res->state & DLM_LOCK_RES_RECOVERING) { 441 spin_unlock(&res->spinlock); 442 mlog(0, "returning DLM_RECOVERING\n"); 443 status = DLM_RECOVERING; 444 goto leave; 445 } 446 447 if (res->state & DLM_LOCK_RES_MIGRATING) { 448 spin_unlock(&res->spinlock); 449 mlog(0, "returning DLM_MIGRATING\n"); 450 status = DLM_MIGRATING; 451 goto leave; 452 } 453 454 if (res->owner != dlm->node_num) { 455 spin_unlock(&res->spinlock); 456 mlog(0, "returning DLM_FORWARD -- not master\n"); 457 status = DLM_FORWARD; 458 goto leave; 459 } 460 461 for (i=0; i<3; i++) { 462 list_for_each(iter, queue) { 463 lock = list_entry(iter, struct dlm_lock, list); 464 if (lock->ml.cookie == unlock->cookie && 465 lock->ml.node == unlock->node_idx) { 466 dlm_lock_get(lock); 467 found = 1; 468 break; 469 } 470 } 471 if (found) 472 break; 473 /* scan granted -> converting -> blocked queues */ 474 queue++; 475 } 476 spin_unlock(&res->spinlock); 477 if (!found) { 478 status = DLM_IVLOCKID; 479 goto not_found; 480 } 481 482 /* lock was found on queue */ 483 lksb = lock->lksb; 484 if (flags & (LKM_VALBLK|LKM_PUT_LVB) && 485 lock->ml.type != LKM_EXMODE) 486 flags &= ~(LKM_VALBLK|LKM_PUT_LVB); 487 488 /* unlockast only called on originating node */ 489 if (flags & LKM_PUT_LVB) { 490 lksb->flags |= DLM_LKSB_PUT_LVB; 491 memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN); 492 } 493 494 /* if this is in-progress, propagate the DLM_FORWARD 495 * all the way back out */ 496 status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore); 497 if (status == DLM_FORWARD) 498 mlog(0, "lockres is in progress\n"); 499 500 if (flags & LKM_PUT_LVB) 501 lksb->flags &= ~DLM_LKSB_PUT_LVB; 502 503 dlm_lockres_calc_usage(dlm, res); 504 dlm_kick_thread(dlm, res); 505 506not_found: 507 if (!found) 508 mlog(ML_ERROR, "failed to find lock to unlock! " 509 "cookie=%u:%llu\n", 510 dlm_get_lock_cookie_node(be64_to_cpu(unlock->cookie)), 511 dlm_get_lock_cookie_seq(be64_to_cpu(unlock->cookie))); 512 else 513 dlm_lock_put(lock); 514 515leave: 516 if (res) 517 dlm_lockres_put(res); 518 519 dlm_put(dlm); 520 521 return status; 522} 523 524 525static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm, 526 struct dlm_lock_resource *res, 527 struct dlm_lock *lock, 528 struct dlm_lockstatus *lksb, 529 int *actions) 530{ 531 enum dlm_status status; 532 533 if (dlm_lock_on_list(&res->blocked, lock)) { 534 /* cancel this outright */ 535 status = DLM_NORMAL; 536 *actions = (DLM_UNLOCK_CALL_AST | 537 DLM_UNLOCK_REMOVE_LOCK); 538 } else if (dlm_lock_on_list(&res->converting, lock)) { 539 /* cancel the request, put back on granted */ 540 status = DLM_NORMAL; 541 *actions = (DLM_UNLOCK_CALL_AST | 542 DLM_UNLOCK_REMOVE_LOCK | 543 DLM_UNLOCK_REGRANT_LOCK | 544 DLM_UNLOCK_CLEAR_CONVERT_TYPE); 545 } else if (dlm_lock_on_list(&res->granted, lock)) { 546 /* too late, already granted. */ 547 status = DLM_CANCELGRANT; 548 *actions = DLM_UNLOCK_CALL_AST; 549 } else { 550 mlog(ML_ERROR, "lock to cancel is not on any list!\n"); 551 status = DLM_IVLOCKID; 552 *actions = 0; 553 } 554 return status; 555} 556 557static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm, 558 struct dlm_lock_resource *res, 559 struct dlm_lock *lock, 560 struct dlm_lockstatus *lksb, 561 int *actions) 562{ 563 enum dlm_status status; 564 565 /* unlock request */ 566 if (!dlm_lock_on_list(&res->granted, lock)) { 567 status = DLM_DENIED; 568 dlm_error(status); 569 *actions = 0; 570 } else { 571 /* unlock granted lock */ 572 status = DLM_NORMAL; 573 *actions = (DLM_UNLOCK_FREE_LOCK | 574 DLM_UNLOCK_CALL_AST | 575 DLM_UNLOCK_REMOVE_LOCK); 576 } 577 return status; 578} 579 580/* there seems to be no point in doing this async 581 * since (even for the remote case) there is really 582 * no work to queue up... so just do it and fire the 583 * unlockast by hand when done... */ 584enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb, 585 int flags, dlm_astunlockfunc_t *unlockast, void *data) 586{ 587 enum dlm_status status; 588 struct dlm_lock_resource *res; 589 struct dlm_lock *lock = NULL; 590 int call_ast, is_master; 591 592 mlog_entry_void(); 593 594 if (!lksb) { 595 dlm_error(DLM_BADARGS); 596 return DLM_BADARGS; 597 } 598 599 if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) { 600 dlm_error(DLM_BADPARAM); 601 return DLM_BADPARAM; 602 } 603 604 if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) { 605 mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n"); 606 flags &= ~LKM_VALBLK; 607 } 608 609 if (!lksb->lockid || !lksb->lockid->lockres) { 610 dlm_error(DLM_BADPARAM); 611 return DLM_BADPARAM; 612 } 613 614 lock = lksb->lockid; 615 BUG_ON(!lock); 616 dlm_lock_get(lock); 617 618 res = lock->lockres; 619 BUG_ON(!res); 620 dlm_lockres_get(res); 621retry: 622 call_ast = 0; 623 /* need to retry up here because owner may have changed */ 624 mlog(0, "lock=%p res=%p\n", lock, res); 625 626 spin_lock(&res->spinlock); 627 is_master = (res->owner == dlm->node_num); 628 if (flags & LKM_VALBLK && lock->ml.type != LKM_EXMODE) 629 flags &= ~LKM_VALBLK; 630 spin_unlock(&res->spinlock); 631 632 if (is_master) { 633 status = dlmunlock_master(dlm, res, lock, lksb, flags, 634 &call_ast); 635 mlog(0, "done calling dlmunlock_master: returned %d, " 636 "call_ast is %d\n", status, call_ast); 637 } else { 638 status = dlmunlock_remote(dlm, res, lock, lksb, flags, 639 &call_ast); 640 mlog(0, "done calling dlmunlock_remote: returned %d, " 641 "call_ast is %d\n", status, call_ast); 642 } 643 644 if (status == DLM_RECOVERING || 645 status == DLM_MIGRATING || 646 status == DLM_FORWARD) { 647 /* We want to go away for a tiny bit to allow recovery 648 * / migration to complete on this resource. I don't 649 * know of any wait queue we could sleep on as this 650 * may be happening on another node. Perhaps the 651 * proper solution is to queue up requests on the 652 * other end? */ 653 654 /* do we want to yield(); ?? */ 655 msleep(50); 656 657 mlog(0, "retrying unlock due to pending recovery/" 658 "migration/in-progress\n"); 659 goto retry; 660 } 661 662 if (call_ast) { 663 mlog(0, "calling unlockast(%p, %d)\n", data, status); 664 if (is_master) { 665 /* it is possible that there is one last bast 666 * pending. make sure it is flushed, then 667 * call the unlockast. 668 * not an issue if this is a mastered remotely, 669 * since this lock has been removed from the 670 * lockres queues and cannot be found. */ 671 dlm_kick_thread(dlm, NULL); 672 wait_event(dlm->ast_wq, 673 dlm_lock_basts_flushed(dlm, lock)); 674 } 675 (*unlockast)(data, status); 676 } 677 678 if (status == DLM_CANCELGRANT) 679 status = DLM_NORMAL; 680 681 if (status == DLM_NORMAL) { 682 mlog(0, "kicking the thread\n"); 683 dlm_kick_thread(dlm, res); 684 } else 685 dlm_error(status); 686 687 dlm_lockres_calc_usage(dlm, res); 688 dlm_lockres_put(res); 689 dlm_lock_put(lock); 690 691 mlog(0, "returning status=%d!\n", status); 692 return status; 693} 694EXPORT_SYMBOL_GPL(dlmunlock); 695